snider



(No Mode.) 2 Sheets-Sheet l.

W. SNIDER.

ADDING MAGHNE.

No. 394,219. Paf-,amd Deo. 1111888.

@Winamax I Snom/Lto c (No Model.) 2 sheets-sheet 2.

W. SNIDERY.

ADDING MACHINE.

No. 394,219. Patented Deo. 1l, 1888.

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3513 K @Houma/Ho N. Pneus, rwwuwgnmr. waning ne UNITED STATES PATENT OEEioE.

VILSON SNIDER, OF MARBLE HILL, MISSOURI, ASSIGXOR OF ONE-HALF TO J. M. SNIDER, OF SAME PLACE.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 394,219, dated December 11, 1888.

Application filed .l'ulyr 6, 1888. Serial No. 279,181. (No model.)

To all whom ii may concern.-

Be it known that I, VILSON SNIDER, a citizen of the United States, residing at Marble Hill, in the county of Bollinger and State of Missouri, have invented a new and useful Improvement in Adding-Machines, of which the following is a specification.

The invention relates to improvements in adding-machines; and it consists in a certain 1o novel construction and combination of devices, that will be more fully described and claimed hereinafter in connect-ion with the accompanying drawings, wherein- Figure l is a front m'ew of an adding-inachine embodying' my improvements, with a ,portion of the front of the case broken away. Fig. 2 is a top plan view with the cover removed. Fig. 3 is a longitudinal central sectional view. Fig. 4. is a transverse sectional 2o view taken in the rear of the dials and lool;-

ing rearward. Fig. 5 is a rear view of the machine, with the rear side of the case broken away.

Referring by letter to the drawings, A des- 2 5 ignates a shaft which is mounted in suitable bearings in the front and rear sides of the case B, and on this shaft, near its rear end, is rigidly secured the toothed wheel O, which is provided with one hundred teeth, and A 3o designates a tubular shaft which is mounted on the shaft A between the wheel C and the front of the case, and on the rear end of this tubular shaft is secured the toothed wheel C', also provided with one hundred teeth.

3 5 D represents a circular dial provided with numbers from one to one hundred, arranged concentrically, which is rigidly secured to the front end of the shaft A close to the front side of the case, and D represents a rim-dial 4o which is arranged concentrically with the dial D, and is rigidly connected to the front end of the tubular shaft A. This rim-dial is provided with a series of numbers from one to one hundred, which series is arranged adjacent to the series of numbers on the inner or circular dial, and through a slit or opening, b, in the front side of the case two adjacent numbers on the said dials may be viewed simultaneously. The shaft A is extended a 5o short distance beyond the front side of the case, and is provided with a cross-head or handle, a, to enable the inner dial to be turned to bring t-he desired number into view before the operation of adding commences, and an opening, b', is formed in the 5 top of the case to enable the outer or rim dial to be similarly adjusted.

A swinging arm, E, is mounted at one end on the rear end of the shaft A, and on its free end is mounted the pawl F, to which the coiled 6o contractile spring f is connected. This pawl is provided at its free end with the detent. F', which engages the teeth of the wheel C, whereby when the free end ot' the swinging arm is depressed the said wheel is turned, and when the swinging arm is raised the pawl slips idly over the teeth. The swinging arm is provided at its inner end with a vertical extension or stud, e, to which is connected the inner end of the contractile spring G, the 7o outer end of which is attached to the case, the object of the spring being to raise the swinging arm after it has been depressed and normally hold it in this position.

The keys H, bearing the figures from l to 9, are arranged on the front ends of the arms 7L 71, which are mounted at their rear ends on a horizontal spindle, h, (arranged in a suitable frame,) and are guided at intermediate points between the parallel vertical bars 712, So and under these arms 7i and extending across the machine is the operating-lever I, pivoted at one end to t-he case and connected at its free end to the free end of thc swinging arm E by the rod K.

The operating-lever I is so arranged that when the key-arms are depressed at their free ends they will bear on the lever and depress it, thereby operating the swinging arm E and causing the toothed wheel C to turn, and it 9o will be seen as the key-arms bear on the lever at varying distances from its pivot those arms near the pivot will cause a much greater movement of the lever than those near its free end. Therefore the liey-arms which are 9 arranged adjacent to the pivoted end of the lever are provided with the high tigures, so that when they are depressed the swinging arm will be moved a greater distance and the toothed wheel C and the inner dial will be me rotated a greater distance than when a key bearing a small number and arranged nearer the free end of the lever is depressed.

L represents a spring-actuated pawl, which engages the teeth of the wheel C' and prevents it from turning, and friction-springs M M are attached to the front side of the wheel C, which bear at their free ends against the rear side of the wheel C', whereby, when the pawl L is disengaged from the last-named wheel, the said springs cause the wheels C and C' to turn simultaneously. The wheel C is further provided on its front side with a stud, m, which engages a 'detent or extension, Z, on the free end of the pawl L, and raises the latter, thereby allowing the wheel C' to turn the distance of one notch or tooth for each revolution of the wheel C. Therefore, after inner dial the stud m engages the detent on the end of the pawl L and allows the rim-dial to register one, and when the inner dial has again registered one hundred units the rimdial will be moved to indicate two, and so on. The upward movement of the free end of the swinging arm is limited by the upper side of the operating-lever coming in contact with the under sides of the key-arms, and to limit the downward movement of the said arms to prevent the inner dial from being moved a greater distance than is sufficient to register the number of the key which is depressed the following means are provided:

A limiting-pawl, N, angular in shape, is mounted in the case in such a position that the detent on the upper end of its vertical arm O may be engaged with the teeth of the wheel C, and a spring, P, is also connected to the said arm to normally hold the detent out of engagement with the teeth. The horizontal arm O' of this pawl is connected by the rod Q to an intermediate point of the lever R, which is arranged below the key-arms and is provided at its front end with a transverse notched bar, S. This bar is adapted to be engaged by either of the said key-arms, and the notches therein, which are arranged, respectively, under the key-arms, are of different depths, so that the key-arms must be depressed varying distances in order to engage and depress the lever R. Then the lever R is depressed, the vertical arm of the pawl N swings toward the wheel C, and the detent O thereon engages the teeth of the wheel and stops its rotation. The notches in the bar S are made of such relative depths that when the keys are depressed the rotation of the wheel C will be stopped when the number of notches which have passed under the detent of the limiting-pawl corresponds with the number on the key which is depressed. Thus, when the key bearing the number S is depressed, the key-arm attached thereto will strike the bar S and cause the pawl N to en- 1' gage the wheel C after eight teeth have passed thev said pawl, thereby preventing further depression of the key-arm and indicating at the opening b a number which is the sum of the number before indicated and the eight units which have been added.

The operation of this adding-machine will now be readily understood without further description thereof herein, and its advantages are that it is simple, the action of the parts is direct, and therefore not liable to be disarranged, and, being provided with no complicated mechanism, it may be cheaply manufactured and readily repaired when out of order.

Having thus claiml. In an zulding-machine, the combination of the concentric shafts A A', the concentric dials D D', attached to the front ends of the described the invention, .I

y shafts, the toothed wheels C C', affixed to the having registered one hundred units on the l rear ends of the said shafts, one of the said wheels being provided with friction-sprin gs to bear against the other wheel to cause them to rotate simultaneously, the swinging arm E, mounted on the shaft A, and provided with a spring-actuated pawl engaging the wheel C, the operating-lever connected at its free end to the free end of the swinging arm, the pawl L, engaging the wheel C', and provided with a detent, Z, adapted to be engaged at intervals by a stud on the wheel C, and the keylevers arranged over the operating-lever and adapted when depressed to operate the same, substantially as specified.

2. In an adding-machine, the combination of the concentric shafts A A', the concentric dials D D', affixed thereto, the toothed wheels C C', arranged on the said shaftsand adapted when released to rotate simultaneously the spring-actuated pawl L, normally engaging the wheel C', and adapted to be raised at intervals by a stud on the wheel C, the swinging arm E, mounted on the shaft A, and pro- IOO vided with an extension or stud, c, having a contractile spring, G, connected thereto, the spring-actuated pawl F, mounted on the free end of the swinging arm and normally engaging the teeth of the wheel C, the key-arms pivoted at their rear ends and provided with figures, and the operating-lever arranged transversely under the key-arms and connected at its free end to the free end of the swinging arm by the rod K, substantially as and for the purpose specified.

3. In an adding-machine, the combination, with the shafts A A', provided with the dials D D' and the toothed wheels C C', respectively, the pawl L, normally engaging the wheel C', and adapted to be disengaged at intervals by a stud on the wheel C, the swinging arm E, provided with a pawl engaging the teeth of the wheel C, and the key-arms connected, substantially as described, with the said swinging arm, of the pawl N, adapted to engage the wheel C and normally held out of engagement therewith, and the lever R, arranged under the key-arms and connected to the pawl N, whereby when a key-arm is depressed the said vlever is operated and the IIO pawl is engaged with the wheel C, all constructed, arranged, and operated substantially as and for the purpose specified.

et. In an adding-machine, the shafts A A', the dials D D', the toothed wheels C C', the key-arms, and suitable means for connecting the said arms to the toothed wheels, whereby when the arms are depressed the wheels are rotated, in combination with the limitingpawl N, normally held out of engagement with the wheel C, the lever R, connected to the pawl, and the notched bar b, affixed to the free end of the lever and arranged transversely under the key-arms, whereby when the latter are depressed the lever R is depressed and the pawl N is operated to engage the wheel C, all arranged substantially as specified.

5. In an adding-machine, the combination, with the case provided with a slit or opening, b, and an opening, b', of the shaft A, having the inner dial, D, affixed thereto and provided outside the case with a suitable handle, d, the tubular shaft A', mounted on the shaft A, and having the rim-dial D' affixed thereto, the toothed wheels C C', attached, respectively, to the rear ends of the shafts A and A', and having the friction-springs M M arranged between their adjacent sides to enable them when released to rotate simultaneously, the pawl L, normally engaging the wheel C', and adapted to be disengaged by a suitable stud on the adjacent side of the wheel C, the lever I, connected, substantially as described, to the wheel (l, and the keyarms arranged above the said lever, substantially as specified.

(i. In an adding-machine, the numbered dial adapted to have one of its numbers exposed at a time and connected to a toothed wheel, the swinging arm provided with a pawl engaging the toothed wheels, and the key-arms connected, substantially as described, to the swinging ar1n,in combination with the checkpawl N, engaging the toothed wheel, the lever R, connected to the pawl, and the notched bar S, arranged transversely under the keyarms and affixed to the free end of the lever, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

\YILSON SNIDER. lYitnesses:

F. M. WELLS, J. F. SANDER. 

